112 



Insect Pests. 



run maiiily up ;inil down lu-tweeii tlie haik and wciod. From tliesfr 



median ehanuels run, on eitlier side, smaller ones, in wliicli the larva; 



live, Tliere is a poj.ular idea that orjlv siekly or nuhealtliy trees are 



attaeked. That thcv are sm moie tlian others is verv probaLle, hut 



perfectly sound trees sutler in tlie same way. 



The mere fact that we find larvii.- and pupie in the dying and dead 



wood does not neces- 

 sarily show that the 

 heetle only attacks 

 such wood. The larx'a; 

 ha\'e caused the un- 

 healthy state or have 

 killed the tree them- 

 selves, and have to 

 finish their develop- 

 nrent wliere they have 

 lived. 



From \-ariotis "h- 

 servations made, it 

 appiears that when fjiice 

 a tree is invaded it 

 forms a centre that 

 attracts the lieetles to 

 LAdposir, and tliusif we 

 i.adv drstroy it at the 

 riuht time, we can use 

 tliese damaged trees as 

 ■■ trap trees '' are used 

 in forestry. Both nld 

 and viumg trees suffei'. 

 In an old orchard 

 where trees ha\"e ue^"er 

 lieen tended, it is no 

 unusual thing to see 

 nuinv (if ihe smaller 



hranches and twigs 1>aretl of bark and showing up pale against tlie 



rest of the wnod. This is usually due to this beetle, 



Frcun llieseold neglc'Cted trees ilirv inxade youul; ami sound ones. 



-I'IKCK "[■ ri.UM >TE>[ -lli'UlN'; 

 "V BAliK BEETLE {S. r>"Jii/' 



(')]iL'-thini ii;itiir;il ,~iz(.- 



i-1. r. [>. JUnfnu 

 ■■ ■■ i'Ll'.UT llnLE- 



LiFK-l-[isTi:)i;v AND HAi;ns. 

 TJie lirellr tliat is tlir cause of tins dania^-e is <[uiie small, oflen 

 moiv ihaii -j^^ iiirli. In cr.limr it is lu.^aily Maek. >vitli souu'- 



